In a Mac OS X app (Cocoa), I'm copying some images from my app to others using a NSDraggingSession. The NSDraggingItem makes use of an object that implements the protocol NSPasteboardItemDataProvid...

So I want to drag an object from one source to multiple potential destinations. When the object is over each destination, I want it to 'morph' into a different image. Is there a straightforward way...